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CHARLESTON, S.C. — Michael Slager, the former South Carolina police officer who fatally shot a man in the back, intends to plead guilty to one federal charge of excessive use of force as part of a plea agreement, a source with direct knowledge of the plea deal said Tuesday.

The charge is a felony and is punishable by up to life in prison. Slager is expected to plead guilty Tuesday afternoon.

Slager’s state murder trial ended in a mistrial in December after a jury failed to reach a verdict. The remaining state murder charges will be dismissed as part of this plea agreement, the source said.